/* 重置浏览器默认样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  /* 设置页面主体的字体和背景色 */
  body {
    font-family: 'Arial', sans-serif;
    background-color: #f8f9fa;
    color: #212529;
    line-height: 1.6;
  }
  
  /* 链接样式 */
  a {
    color: #007bff;
    text-decoration: none;
  }
  
  a:hover {
    color: #0056b3;
    text-decoration: underline;
  }
  
  /* 标题样式 */
  h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    font-weight: 500;
    line-height: 1.2;
  }
  
  /* 全局容器样式 */
  .container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 15px;
  }
  
  /* 全局表单样式 */
  form {
    margin-bottom: 1rem;
  }
  
  .form-group {
    margin-bottom: 1rem;
  }
  
  .form-control {
    display: block;
    width: 100%;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
  }
  
  .form-control:focus {
    color: #495057;
    background-color: #fff;
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
  }
  
  /* 按钮样式 */
  .btn {
    display: inline-block;
    font-weight: 400;
    color: #212529;
    text-align: center;
    vertical-align: middle;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
  }
  
  .btn-primary {
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
  }
  
  .btn-primary:hover {
    color: #fff;
    background-color: #0056b3;
    border-color: #004085;
  }
  
  /* 卡片样式 */
  .card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: #fff;
    background-clip: border-box;
    border: 1px solid rgba(0, 0, 0, 0.125);
    border-radius: 0.25rem;
  }
  
  .card-body {
    flex: 1 1 auto;
    padding: 1.25rem;
  }
  
  /* 边距和间距的调整 */
  .mb-4 {
    margin-bottom: 1.5rem !important;
  }
  
  .mt-2 {
    margin-top: 0.5rem !important;
  }
  
  .mt-4 {
    margin-top: 1.5rem !important;
  }
  
  .p-3 {
    padding: 1rem !important;
  }
  
  .p-4 {
    padding: 1.5rem !important;
  }
  
  .bg-light {
    background-color: #f8f9fa !important;
  }
  
  .bg-dark {
    background-color: #343a40 !important;
    color: #fff;
  }
  
  .text-white {
    color: #fff !important;
  }
  
  .text-center {
    text-align: center !important;
  }
  
  .text-left {
    text-align: left !important;
  }
  